A kind of normal temperature sulfur solvent and preparation method thereof

Abstract

The invention discloses a novel normal-temperature efficient sulfur solvent and a preparation method thereof, and belongs to the field of chemical agents for oil-gas fields. According to the preparation method, primary amine with an RNH 2 structure is used as a main agent to mix with an inorganic basic catalyst and a co-catalyst with a heterocyclic molecular structure according to a certain proportion, thereby obtaining a primary amine sulfur solvent applicable to a high-sulfur gas field. The novel normal-temperature efficient sulfur solvent disclosed by the invention has the advantages of being high in sulfur solubility and high in dissolution rate, having no offensive odors, and being low in cost, noncorrosive, and easy to operate at normal temperature; and 1g of the solvent can dissolve more than 0.8g of sulfur at normal temperature in only 1.26 minutes, and the sulfur dissolving effect is obviously superior to that of an existing amine sulfur solvent.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and specifically relates to a novel normal-temperature high-efficiency sulfur solvent and a preparation method thereof. Background technique [0002] A number of unconventional high-sulfur gas reservoirs have been discovered at home and abroad. During the development of such gas reservoirs, a harmful substance called elemental sulfur (i.e., S 8 ). As environmental conditions change, elemental sulfur condenses and deposits from the gas stream in the form of sulfur crystals. Elemental sulfur is easy to deposit in the production layer, wellbore and gathering and transportation system, causing sulfur blockage, especially the blockage of gas pipelines, which brings great harm to the development of this type of gas reservoir. This problem occurs in high-sulfur gas reservoirs. need to be resolved in the development. Therefore, the development of efficient sulfur solvents is an excellent choice to so...

AI Technical Summary

Problems solved by technology

[0003] Since the 1980s, research on sulfur solvents has begun at home and abroad, mainly represented by the DMDS (dimethyl disulfide) sulfur solvent system in Canada and the United States. At the beginning of the 20th century, domestic Li Li, Liu Jianyi, etc. People conducted further research on the system and obtained a higher-performance DMDS sulfur solvent system, but DMDS is expensive, highly volatile, has a pungent odor, and is highly toxic

[0004] CS without DMDS 2 Although (carbon disulfide) has a good sulfur-dissolving effect, it is toxic, has a low ignition point, and is explosive, so it is rarely used. Although other amines, benzene-based and alcohol-based sulfur solvents also have a certain ability to dissolve sulfur, they cannot be used at 30°C. When the sulfur solubility does not exceed 30%, and the sulfur dissolving speed is slow, the dosage is large, and the relative cost is high

[0005] The currently recognized DMDS system with the best sulfur solubility has a sulfur solubility of 173.6% at 25°C and a sulfur solubility of 610.9% at 90°C. However, DMDS not only has pungent odor, high toxicity, poor stability, but also is expensive. Low cost performance

[0006] In 2008, Liu Jingcheng and others compounded triethylenetetramine, ethanolamine, and ethylene glycol in a ratio of 2:2:1. The compounded solvent has higher sulfur solubility and faster sulfur dissolution rate, but the system is more corrosive

[0007] In 2013, Huang Xuesong and others developed a sulfur solvent suitable for high-sulfur gas fields with no foul smell, low toxicity, and no strong pungent odor. The sulfur solvent is composed of diethylenetriamine, DMF (dimethylformamide) Although the system has higher sulfur solubility and sulfur dissolution rate than the triethylenetetramine system developed by Liu Jingcheng et al., the sulfur solubility is only 40.25% to 49.90%. The sulfur solubility still cannot meet the actual requirements, and the three Ethylenetetramine and diethylenetriamine are both highly corrosive and severely corrosive to pipelines

Images